package com.hmdp.utils;


import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.util.StrUtil;
import com.hmdp.dto.UserDTO;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.web.servlet.HandlerInterceptor;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.LOGIN_USER_TTL;

public class RefreshTokenInterceptor implements HandlerInterceptor {

    private StringRedisTemplate stringRedisTemplate;
    //这个class LoginInterceptor是手动创建的，而不是spring创建的，不能通过Resource注入

    //采用构造函数来进行
    public RefreshTokenInterceptor(StringRedisTemplate stringRedisTemplate) {
        this.stringRedisTemplate = stringRedisTemplate;
    }

    @Override
    public boolean preHandle(HttpServletRequest request, HttpServletResponse response, Object handler) throws Exception {
        /*//1.获取session
        HttpSession session = request.getSession();*/

        //TODO 1.获取请求头中的token
        String token = request.getHeader("authorization");
        if (StrUtil.isBlank(token)) {
            /*// 不存在， 拦截， 返回401  状态码
            response.setStatus(401);*/
            return true;//直接放行
        }

        /*//2.获取session中的用户
        Object user = session.getAttribute("user");*/

        // TODO 2.基于TOKEN获取redis中的用户
        String key = RedisConstants.LOGIN_USER_KEY + token;
        Map<Object, Object> userMap = stringRedisTemplate.opsForHash().
                entries(key);
        if (userMap.isEmpty()) {
            /*//4.不存在，拦截,返回401的状态
            response.setStatus(401);*/
            return true;
        }


        /*//3.判断用户是否存在
        if (ObjectUtil.isNull(user)) {
            //4.不存在，拦截,返回401的状态
            response.setStatus(401);
            return false;
        }*/
        //TODO 5.将查询到的Hash数据转为UserDTO对象
        UserDTO userDTO = BeanUtil.fillBeanWithMap(userMap, new UserDTO(), false);

        //5.存在，保存用户信息到ThreadLocal
        UserHolder.saveUser(userDTO);

        //TODO 7.刷新token的有效期
        stringRedisTemplate.expire(key,LOGIN_USER_TTL, TimeUnit.MINUTES);

        //8.放行
        return true;
    }

    @Override
    public void afterCompletion(HttpServletRequest request, HttpServletResponse response, Object handler, Exception ex) throws Exception {
        //移除用户
        UserHolder.removeUser();
        // HandlerInterceptor.super.afterCompletion(request, response, handler, ex);
    }
}
